Drinking all types of alcohol also counts towards achieving this perk.

If you have both the Day Tripper and Chemist perks, their effects multiply. For example, the healing effect of brahmin meat normally last for 15 seconds; with these two perks, it increases the duration up to 40 seconds. This is likely due to the game engine defining a chem as anything that can "wear off," which food does in the game.

The increased duration of healing items does not show up in the list of effects for the items on the Pip-Boy.